From what I have been researching sounds like the 400 pound pull brings nothing negative to the table if you’re using the 452X.
IMHO anything over 200lb could shorten the life of the string, when you get upwards of 400lb you are putting a lot of undue stress on the string fibers which could lead to a very nasty failure.
I could be wrong but do I really want to take the chance I think not.